PLA/PHA活性抗菌薄膜对蓝莓低温保鲜效果的影响  

Effect of PLA/PHA active films on preservation of blueberries during cold storage

作　　者：沈春华[1,2] 李立 杜云飞[1,2] SHEN Chun-hua1,2, LI Li1,2,DU Yun-fei1,2(1. College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China ;2. Engineering Research Center of Food Thermal-Processing Technology, Shanghai 201306, Chin)

机构地区：[1]上海海洋大学食品学院,上海201306 [2]上海海洋大学食品热加工工程中心,上海201306

出　　处：《食品与机械》2018年第7期121-126,共6页Food and Machinery

摘　　要：采用流延成膜工艺,分别添加质量分数为5%的茶树精油和尤加利精油,制备聚乳酸/聚羟基脂肪酸酯(PLA/PHA)可降解活性抗菌薄膜。以蓝莓为研究对象,在(4±1)℃贮藏条件下,分别采用PLA/PHA保鲜膜包装、茶树精油/PLA/PHA保鲜膜包装、尤加利精油/PLA/PHA保鲜膜包装处理。通过测定3种薄膜的基本性能,袋内氧气和二氧化碳体积分数,蓝莓的烂果率、失重、硬度、可溶性固形物含量、总酚、花色苷和V_C含量等指标,探讨不同活性抗菌薄膜对蓝莓低温贮藏品质的影响。结果表明:含有精油的活性抗菌薄膜能有效降低蓝莓果实的烂果率、失重率,延缓果实花色苷和V_C含量的降低,一定程度上保持了果实的硬度。其中,尤加利精油/PLA/PHA保鲜膜包装对维持蓝莓果实新鲜度,降低果实水分蒸发,维持总酚含量效果最佳。The degradable active antibacterial PLA/PHA films were prepared with 5% tea tree oil and 5% eucalyptus essential oil,respectively by extrusion-casting method.Fresh blueberries were stored at（4±1）℃ and then packaged in PLA/PHA cling film,tea tree oil/PLA/PHA cling film and eucalyptus oil/PLA/PHA cling film,respectively.The basic properties of the three films were measured.The content of oxygen and carbon dioxide in the bags,decay rate,weight loss rate,firmness,total soluble solids content,total phenol,anthocyanin,and vitamin C content of blueberries were measured every 7 days.The quality of blueberries with different films were compared during storage time.The results showed that the active antibacterial film containing essential oils could effectively reduce the rate of fruit rotting and weight loss of blueberry and delayed the decrease of anthocyanins and vitamin C content of fruits compared with the control group,while maintaining the firmness of fruits.Eucalyptus oil/PLA/PHA cling film packaging is better for maintaining blueberry fruit freshness,reducing fruit moisture evaporation,and maintaining total phenolic content.

关 键 词：蓝莓 PLA 茶树精油 尤加利精油 活性包装 

分 类 号：TS255.3[轻工技术与工程—农产品加工及贮藏工程] TS206[轻工技术与工程—食品科学与工程]